1. Section 2.2 Plant Organ Systems

2. Plant Organ Systems
System – a group of tissues and organs that perform specific functions
Shoot System –supports the plant, performs photosynthesis, and transports sap
Diagram 2.2-1
Root System – takes in water & nutrients from the soil and transports them to the shoot system

3. Importance of Water plants cannot survive without water WHY?
1. nutrients need to be dissolved in water in order to be absorbed
2. photosynthesis cannot take place without water
too much water is also bad
if spaces between soil molecules are filled with water, there will not be enough room for oxygen

4. Moving Water Through the Systems
“The push from below”
How does water move upward in a plant (against gravity)?
water enters the root by osmosis and moves toward the centre of the root into the xylem vessels
the pericycle prevents the water from moving backward
root pressure builds up in the xylem and pushes water up
Diagram 2.2-2

5. Moving Water Through the Systems
“The pull from above”
while the roots push the water column from below, the leaves pull from above. Transpiration aids in this process.
Diagram 2.2-4

6. The Movement of Maple Sap
In the spring, sucrose from the roots flows “upward” to help produce leaf buds.
In the summer and fall, the leaves produce glucose that moves “downward” to be stored in the roots.
Glucose
Glucose
Sucrose
Sucrose
Starch
Starch

7. Things you should now know:
Section Review
Things you should now know:
the function and characteristics of the root and shoot systems
the function and properties of xylem and phloem tissue
the tissues and processes involved in moving water and nutrients
the movement and storage of the products of photosynthesis

8. Homework Read pg. 70-75 in the student textbook.
Complete questions # 1-6